Custom SDF callback possible?

[Fyrestar]

I'm looking since ages for a physics lib that supports providing custom SDF (solid distance field) callbacks, so the engine calls for returning a distance-to-surface value by the coordinate provided.

So what i'm essentially looking for is just providing the engine a SDF callbak, such as for a noise based terrain. Does bullet even has an API for it and is it ported by ammo? (or could be accessed?)